Shears.



D. W. VAN TINE.

SHEARS.

APPLICATION FILED MAR. 21, 1908.

1,083,871, Patented Jan. 6, 1914.

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WTTEE SATE PATENT OFFIQE.

DAVID W. VAN TIN E, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO B.HEINISCHS SONS (30., OF NEWARK, NEYV JERSEY, A CORPORATION OF NEWJERSEY.

SHEARS.

To all whom it may concern:

Be it known that I, DAVID W. VAN TINE, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented new and useful Shears, of which the following is aspecification.

This invention relates to an improvement in shears of the type used forcutting sheet metal such as sheet steel, sheet iron and the like.

It has for an object to facilitate the cutting of sheet metal work andespecially work involving the trimming of sharp corners, following asinuous outline, or any cutting in which the direction of the cut ischanged. As well known the ordinary metal-cutting shears, or snips areso formed that the jaws interfere with the severed portions of thematerial and greatly increase the labor of cutting.

It consists of a pair of levers so pivoted as to afford a maximumleverage and provided with cutting jaws having side cheeks or reinforcedportions that are cut away to make space for the material as it issevered in a cutting operation.

It further consists of a strengthened or reinforced fulcrum point formedby increasing the area of the metal at this portion so as to withstandall oppositely acting forces during a shearing movement.

For the purpose of illustrating my invention, I have shown in theaccompanying drawings one form thereof which is at present preferred byme, since the same has been found in practice to give satisfactory andreliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Figure 1 represents a perspective view of a pair of shears embodying myinvention. Fig. 2 represents a perspective View of one of the handles.Fig. 3 represents a section on line wm, Fig. 1. Fig. 4: represents aside elevation of a portion of one of the members.

Similar numerals of reference indicate corresponding parts in thefigures.

Specification of Letters Patent.

Application filed March 21, 1908.

Patented Jan. 6, 1914.

Serial No. 422,487.

Referring to the drawings :-1 designates the handles of a pair of leversforming the shears embodying my invention and which have integraltherewith jaws 2, faces 3, finished as a plane surface and adapted to bepositioned in close proximity to each other. The edges 4- of the face 3have a taper more or less gradual from the base of the jaw 2 to the toethereof where they terminate in a sharp point, whereby a finished orclean out may be made in corners of the metal. These cheeks 5 terminatein the outer edge 6 of the jaws which is inclined forwardly, that istoward the toe and curves inward to meet the toe at the termination ofthe edges 4. By means of this tapered edge also a cut may be madethroughout the length of the metal the finish of which is clean andsharp without leaving a burr or ragged edge. Furthermore this taperfacilitates close following of a curved outline since there issuiiicient clearance provided thereby, so that the severed portions ofthe sheet metal do not press against the jaw of the shears to impede theoperation.

From the face 8 the jaws 2 taper outwardly forming the inclined checks 5for the purpose of allowing the cut edges of the metal to be onlyslightly depressed during the cutting operation. The two parts so fardescribed are pivotally joined together by any suitable means as thebolt 7 and nut 8. This bolt 7 forms the fulcrumv point of the leversfrom which the handles 1 are offset a suliicient distance to permit aneffectual leverage to be obtained whereby the jaws may easily be broughttogether to shear the material. This offset is formed of an upwardlyextending portion 9 which inclines till it reaches a suitable point 10where it takes a downward direction forming the handle 1. The point 10where the contour of the handle changes is dependent on the length ofthe handle and the leverage desired.

Integral with the handles are hand grips 11 which are provided withprojecting portions 12 adapted to contact with each other thus formingstops to allow the jaws to come into direct alinement with each other oncompleting a out. These grip members 11 are preferably located in thesame plane to allow ease of manipulation, but as the handles approachthe fulcrum point there is a divergence as indicated in Fig. 1 so thatthe inclined portions 9 throw the jaws directly over one another. Inorder to form a fulcrum point of exceeding strength to withstand theshearing operation, an excess of material or bulge 13 is providedforming an offset back portion allowing plenty of metal on either sideof the fulcrum bolt 7 It will be noted that in cross-section through thefulcrum, the two handle members are practically flat on both sides andof substantially the same thickness as the handle for the reason thatthere is only a slight strain in a vertical plane at this point, theexcess of material as shown at 13 allowing for the shearing strain. Asthe surfaces 14: approach the rear of the jaw members they have anoutwardly inclined portion 15 in order to give a substantial backing tothis portion of the jaw where the initial strain in a cutting operationtakes place.

It will be apparent that l have devised an exceedingly simple andefiicient shearing implement adapted for the cutting of sheet metal suchas steel, iron, copper or the like and one in which, owing to theleverage obtained and the novel shape cutting jaws I am enabled to makea out which will follow readily a sinuous outline or make a sharp turnas desired.

It will be apparent that while I have described my invention as beingapplicable to cutting metal, it is equally adapted for cutting carpet,linoleum, oil cloth and other heavy or thick material, as will beapparent to those skilled in the art.

Having thus described my 1nvent1on,what

I claim as new and desire to secure by Letone serving as a cutting edge,side cheeks extending outwardly from the side edges and converging withrespect to each other, whereby said cutting blades, in cross section,are truncated triangular, a pivot suitably connecting said members, saidpivotbeing situated in a plane passing tnrough the center of each ofsaid cutting blades, and an operating handle integral with each blade,offset from the median line of the blades and in the plane thereof, andfurther laterally otlset out of the plane of the blades, whereby theoperating handles are situated in the same plane without cutting awaythe material forming the members and so weakening the same, and a bulgeadjacent the pivot opening on each member on the side thereof oppositeto that of the cutting edge.

DAVID W. VAN TINEQ Witnesses:

E. HAYWARD FAIRBANKS,

C. D. MoVAx.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

